Known is liquid/gas jet device (RU Patent 2107841 F 04 F 5/02, 1998) that comprises an active liquid nozzle, a mixing chamber and a diffuser, wherein the minimum mixing chamber section area is 0.1 to 7.98 time the minimum section area of said liquid nozzle.

The efficiency of said jet device is low due to the low mixing of the passive gas and the active liquid flows.

Known also is liquid/gas jet device (RU Patent 2113629 F 04 F 5/02, 1998) that comprises an active liquid media feeding nozzle and a mixing chamber, wherein said active liquid media feeding nozzle has a central and a peripheral ring shafts for active media feeding, and the total outlet section area of the active media feeding nozzle is determined by the ratio of the central nozzle shaft outlet section and the minimum mixing chamber section.

The efficiency of said jet device is low due to the low mixing of the passive gas and the active liquid flows.

Known also is liquid/gas ejector (US Patent 2382391 F 04 F 5/02, 1945) that comprises a distribution chamber with nozzles, an inlet chamber, a mixing chamber and a discharge chamber, wherein each chamber is coaxial with its appropriate nozzle.

The efficiency of said jet device is low due to the low mixing of the passive gas and the active liquid flows.

The closest counterpart of the device suggested herein is liquid/gas jet device (US Patent 2632597 F 04 F 5/02, 1953). Said device comprises a casing with one or more nozzles and the same number of diffusers and mixing chambers.

The efficiency of said jet device is low due to the low mixing of the passive gas and the active liquid flows.

Studies have shown that the above liquid jet devices do not provide for the required output and efficiency due to the low mixing of the media (active and passive).

Therefore the object of the present invention is to increase the efficiency of the liquid/gas jet device by optimizing the mixing of the gaseous and liquid media in the flow section of the jet device.

The present object can be achieved by using a liquid/gas jet device that comprises a set of nozzles with at least one nozzle and at least one primary mixing chamber located coaxially in front of, and at least partially around each of said nozzles, a secondary mixing chamber the inlet of which is located in front of the outlets of the primary mixing chambers and the outlet is combined with the diffuser inlet, and an inlet chamber that contains the nozzles of said set of nozzles, the primary mixing chambers and the inlet of the secondary mixing chamber. Preferably, the set of nozzles comprises at least two nozzles that may be installed either parallel or not parallel to each other and no coaxially with the secondary mixing chamber. Usually the outlet of the nozzle is spaced from the outlet of the primary mixing chamber by a distance not greater than 100 diameters of the nozzle outlet. The primary mixing chamber is usually a cylinder, a cone or a combination thereof. Usually, the minimum primary mixing chamber section area is 1-15 minimum nozzle section areas. Preferably, the ratio between the minimum secondary mixing chamber section area and the total area of the minimum primary mixing chambers is 1-300, and the ratio of the lengths of the primary and secondary mixing chambers to their minimum sections is 0.1 to 500. The set of nozzles has a common base on which at least one but, preferably, two nozzles are installed, wherein the active (ejecting) high-pressure medium is fed to the rear surface of the base. Moreover, said device may additionally comprise at least one secondary mixing chamber. In that case the outlets of part of the primary mixing chambers are connected to one secondary mixing chamber, and the outlets of the other primary mixing chambers are connected to the other mixing chamber. The device may additionally contain at least one diffuser connected to the additional secondary mixing chamber.

Studies have shown that the mixing of the active (ejecting) and the passive (ejected) media greatly affects the efficiency. of the liquid/gas jet device. Therefore, in order to improve the mixing of the media, two types of mixing chambers are used in the ejector, i. e. the primary mixing chamber that is cocentric with each nozzle of the set of nozzles and the secondary mixing chamber to which all the jets from the primary mixing chambers are directed and where the gas and the liquid are finally mixed. The primary mixing chambers are used for preliminary mixing of the gas and the liquid and the formation of vortex zones and turbulization of the liquid jet with gas. As a result the jet is more intensively split into separate jets after the primary mixing chambers and entraps larger amounts of the ejected gas as compared with single mixing chamber ejectors. The turbulization can be further enhanced by using two or more primary mixing chambers with nozzles and by positioning the chambers not parallel to the secondary mixing chamber axis.

Moreover, it is well known that ejected gas will more readily penetrate to the central jets between tubes of the primary chambers because the impedance coefficient for lateral circumvention of solid cylinders by gas is several times lower than for the impedance coefficient for similar circumvention of liquid jets by gas.

The basic embodiment of the present invention can be illustrated by the figure attached hereto, wherein the following notations are used: set of nozzles 91), nozzle (2), primary mixing chamber (3), secondary mixing chamber (4), diffuser (5) and inlet chamber (6).

The present device operates as follows: jets of the active liquid from each nozzle (2) of the set of nozzles (1) is directed to the primary mixing chamber (3) where it is preliminarily split and mixed with the passive gas fed from the inlet chamber (6). After the outlet of the primary chamber the jet is completely split and the passive gas is finally entrapped. After that the liquid/gas jet is fed to the secondary mixing chamber (4) where the jet velocities are equalized and the pressure is increased. From the secondary mixing chamber the jet is fed to the diffuser (5) where the pressure is further increased.

The use of the present invention allows one to increase the efficiency in comparison with the closest counterparts by 8- 12%.